1.1 Properties of electric charges & Coulomb’s Law, capacitance

What happens when a negatively charged person reaches for a metal door handle, causing a spark?

• The metal handle gains a positive charge.

• Electrons jump from the person to the handle.

• The person's body becomes neutral.

• Protons are transferred from the handle to the person.

What causes static electricity to build up in clouds?

• Gravity pulling water particles downwards.

• Friction between moving particles of water or ice.

• The sun's heat evaporating water.

• Chemical reactions within the cloud.

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Why do aircraft become electrically charged when flying through the air?

• Due to the aircraft's engines generating electricity.

• Because of the high altitude.

• Friction between the plane and air particles.

• The plane's metal body attracting charges.

What measure is taken to prevent explosions caused by static electricity during vehicle refuelling?

• Adding chemicals to the fuel to make it more conductive.

• Cooling the fuel before pumping.

• Using plastic fuel nozzles.

• Increasing the speed of fuel flow.